How a fatigued pilot's inputs turned a landing into a structural failure

Countries & Cities · Published 15 October 2026 Swipe more like this →

In short: In 2009, a FedEx MD-11 crashed at Narita Airport after a series of violent bounces. Investigators found that the pilots, suffering from extreme sleep deprivation, struggled with the aircraft's complex physics, leading to a catastrophic structural failure that tore the wing from the fuselage.

The crash of FedEx Express Flight 80 on March 23, 2009, was driven by a combination of environmental factors and human performance. Operating in gusty conditions with winds exceeding 40 knots, the McDonnell Douglas MD-11 attempted a landing on Runway 34L. The Japan Transport Safety Board (JTSB) identified a high touchdown sink rate as the primary catalyst. To minimize the risk of floating down the runway in crosswinds, the first officer executed a late flare, which suppressed the sink rate too late, causing the plane to strike the ground with significant force.

This initial hard landing triggered a phenomenon known as "porpoising," where the aircraft bounced repeatedly. Instead of following approved procedures—which required holding a specific 7.5-degree pitch angle and using thrust to control the descent—the first officer applied large nose-down inputs. These erratic movements caused the plane to strike on its nose gear first, then bounce again. The final touchdown was so violent (reaching 1,200 ft/min) that the force transferred into the left wing exceeded its design limits, causing the wing to detach and the aircraft to invert and catch fire.

The human element was central to the tragedy. Investigations revealed that both the captain and first officer had received no more than four hours of consecutive sleep in the 24 hours preceding the flight. Furthermore, the first officer, who typically served as a relief pilot, had very little experience landing the MD-11. The JTSB ultimately recommended that Boeing improve the aircraft's Longitudinal Stability Augmentation System (LSAS) to limit large nose-down inputs during touchdown and provide aural warnings for gear touchdown status to prevent similar structural failures.

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